package com.itheima.mapper;

import com.itheima.pojo.Emp;
import org.apache.ibatis.annotations.*;

import java.time.LocalDate;
import java.util.List;

@Mapper
public interface EmpMapper {

    // 根据ID删除用户
    @Delete("delete from emp where id = #{id}") // 预编译SQL
//    @Delete("delete from emp where id = ${id}")  // 拼接SQL, 性能低，有SQL注入风险。
//    public void delete(Integer id);
    public int delete(Integer id);

    // 新增用户
    @Options(useGeneratedKeys = true, keyProperty = "id")
    @Insert("insert into emp(username, name, gender, image, job, entrydate, dept_id, create_time, update_time) " +
            "values (#{username}, #{name}, #{gender}, #{image}, #{job}, #{entrydate}, #{deptId}, #{createTime}, #{updateTime})")
    public void insert(Emp emp);

    // 更新员工
    @Update("update emp set username = #{username}, name = #{name}, gender = #{gender}, image = #{image}, job = #{job}," +
            " entrydate = #{entrydate}, dept_id = #{deptId}, update_time = #{updateTime} where id = #{id};")
    public void update(Emp emp);

    // 根据ID查询员工
  /*  @Select("select * from emp where id = #{id}")
    public Emp getById(Integer id);*/

    // 方案一：给字段起别名，让别名和属性名一致
   /* @Select("select id, username, password, name, gender, image, job, entrydate," +
            " dept_id deptId, create_time createTime, update_time updateTime from emp where id = #{id}")
    public Emp getById(Integer id);*/

    // 方案二：通过@Results,@Result注解手动映射封装
   /* @Results({
        @Result(column = "dept_id", property = "deptId"),
        @Result(column = "create_time", property = "createTime"),
        @Result(column = "update_time", property = "updateTime"),
    })
    @Select("select * from emp where id = #{id}")
    public Emp getById(Integer id);*/


    // 方案三：开启mybatis驼峰名字自动映射开关
    @Select("select * from emp where id = #{id}")
    public Emp getById(Integer id);


    // 条件查询员工
    /* @Select("select * from emp where name like '%${name}%' and gender = #{gender} and " +
            "entrydate between #{begin} and #{end} order by update_time desc;")*/  // 性能低，不安全，存在sql注入问题。
   /* @Select("select * from emp where name like concat('%', #{name}, '%') and gender = #{gender} and " +
            "entrydate between #{begin} and #{end} order by update_time desc;")
    public List<Emp> list(String name, Short gender, LocalDate begin, LocalDate end);*/

    // 动态条件查询
    public List<Emp> list(String name, Short gender, LocalDate begin, LocalDate end);

    // 动态更新员工
    public void update2(Emp emp);

    // 批量删除员工
    public void deleteByIds(List<Integer> ids);




}
